This is a brochure for Devonshire's Earth Salts, Mineral Elements, manufactured by: F.S. Powers and Company, 24 North williams Street, Crystal lake, Illinois.; in 1936. No copyright notice evident, Public Domain under Rule 5 of the United States Copyright Statutes. Dimensions 3 1/2" width by 5 1/2" Height. Etext created by Gerard Arthus.